Characteristics of sheet metal cutting cnc laser 

Laser cutting is a commonly used cutting method in the industry. It refers to the use of a focused high-power density laser beam to irradiate the target so that the irradiated material can quickly melt, vaporize, ablate or reach the ignition point, and with the help of the high-speed airflow leading to the laser to blow away the molten material, to complete the purpose of cutting the workpiece. It belongs to one of the thermal cutting methods.

Application of laser cutting

Laser cutting has a wide range of applications, whether metal or non-metal, laser cutting can be used. A CO2 laser cutting machine can be used to cut non-metal, such as cloth, leather, etc., and an optical fiber laser cutting machine can be used to cut metal.

What is overburning?

A laser cutting machine will produce a lot of heat when processing sheet metal. Under normal circumstances, the heat will spread along the cutting section to the inside of the sheet metal. In the processing of small holes by laser cutting machine, the outside of the hole can be fully cooled, and the small hole part inside the single hole has a small diffusion space, so the heat cannot be diffused, and excessive concentration will cause over burning, slag hanging, etc. In addition, during thick plate cutting, the molten metal accumulated on the surface during the perforation process and the high heat accumulation required for thick plate cutting will disorder the auxiliary gas, increasing heat, thereby causing overburning.

How to avoid overheating when laser cutting sheet metal?

1. Add a cooling point or use a ring cutting function

When cutting plates with sharp corners, the position where overburning is more likely to occur is often at the sharp corners. Overburning will cut the sharp corners into circles. At this time, you can add a cooling point at the sharp corners, pause at the sharp corners, and blow air, which can effectively avoid overburning. Or adopt the circular cutting function, which can avoid the over-burning phenomenon caused by too much heat caused by slow speed at the sharp corner.

1. Using high-power lasers

When cutting carbon steel, a higher power laser can be used, and the bright surface cutting process can effectively avoid overburning, and this cutting process can cut out finished products without burrs and bright cutting surface. High power can effectively avoid overburning.

1. Cutting with nitrogen

In the sheet metal cutting with oxygen as auxiliary gas, nitrogen can be switched to cut. When cutting with nitrogen, the material is completely melted by laser energy, and the nitrogen will not easily react with the sheet metal itself. The temperature in the melting point area is relatively low, coupled with the cooling and protective effect of nitrogen, the reaction is stable and uniform, and the cutting quality is high. The section is fine and smooth, the surface roughness is low, and there is no oxide layer.

1. Increase air pressure

When using a laser cutting machine to process aluminum alloy and stainless steel, the auxiliary gas used is nitrogen or air, and edge burning will not occur during cutting. However, due to the high temperature of the material inside the small hole, the slag hanging phenomenon inside will be more frequent. In this case, burr and slag can be reduced by increasing the pressure of auxiliary gas.

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